IBM’s Relative Performance (rPerf) metric is a great tool for comparing commercial workload performance between different Power System servers. It’s often. This post outlines a recent Nigel Griffiths tweet about estimating rperf for your LPAR. Read on to find out more. Articles on IBM AIX performance including server throughput, system performance and IBM AIX commands.

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There is an excellent article in a recent IBM Systems Magazine on exactly this subject and I refer you to that rather than duplicate it here.

But I hope this blog entry will help every one to either get it right first time or at least set realistic expectation and outline some prime areas that will need investigation to realise benefits, thanks Nigel Tags: This has resulted in the publication of multiple rPerf values for each server based on varying processor core counts.

There are many pitfalls in using benchmarks in computer sizing endeavors. Having stated that, many people use rPerfs as a simplistic way of preparing a guesstimate to planning new machines based on running POWER workloads for both rrperf migration and server consolidation. You will have to apply your own rules for that. How will the script get updated?

rPerf Definition from PC Magazine Encyclopedia

If you would like to rpdrf your cookie settings at any time please view our privacy policy for additional information. In addition, most benchmark rules require that the full benchmark be run and fully documented for each published data point. Note, although rpeerf may be used to compare estimated IBM UNIX commercial processing performance, actual system performance may vary and is dependent upon many factors, including system hardware configuration, software design, and configuration.


For LPARs the number may be estimated but it is a simple maths calculation i. Posted January 3, Permalink. The tuning setting from older machines and OS aaix unlikely to work perfectly. If capped should the script use Entitlement and not VP?

If you are break just one or two and then only a little bit then you never know – “you might get lucky”. The pSeries is the rperrf reference system and has a value of 1. Read The Current Issue: The most exciting POWER6 enhancement, live partition mobility, allows one to migrate a running LPAR to another physical box and is designed to move running partitions from one POWER6 processor-based server to another without any application downtime whatsoever.

Thanks for your use, help and feedback, Nigel Griffiths.

I have done this sort of exercise myself in the past. You have to be realistic and understand that you will need to be able to move up to later levels of software and firmware to take advantage of improvements.

IBM is currently completely out of “magic pixie dust” to rerf problems without changes. Actual performance will vary, based on application and configuration details. AIXpert Blog Log in to participate. If you would like to change your cookie settings at qix time please view our privacy policy for additional information.

How do I use the vio Read The Current Issue: This is especially important for older, single threaded applications that cannot exploit the benefits of SMT. More Articles From Tom Farwell.

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We use cookies to optimize your visit to our website. Particularly as you move to larger servers, the topology of the cores and memory that are used can have a big effect on the cache and memory affinity of the LPAR and thus have a big effect on the actual performance. If one is studying the performance of a computer system, logic states that the best way is to apply the actual workload on the system and measure the results. The savvy performance analyst knows that it’s neither feasible at this point in time nor cost-effective to set up actual rpwrf testing of the new software.


The amount of rPerfs required to run existing workloads can be determined and aic to size new servers. Type in a Name: Running the same computer benchmark on multiple computers allows for comparison. The official rPerf numbers for current and older machines can be found here: So lets talk about things you should think about when using rPerf to make sizing or performance estimates.

Sizing with rPerf but Don’t Forget the Assumptions (AIXpert Blog)

Having this comprehensive set of information makes it easier to estimate the commercial workload CPU performance for any Power Systems server. If you are some where between these options then you may have to make a series of changes, upgrades or updates to achieve good performance on your new machine. He can be reached through www. If you are breaking a lot of these assumptions then you may not get the performance you expected or hoped to achieve. Particularly, take and early opportunity to apply the first two updates after the initial release.

In this case, the script guesses the rPerf based on rPerf numbers in a fairly crude way.

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